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M-Ke Thermaflex Flexible Hvac Duct - 7 Inch Diameter R6.0

Usually ships in 7 to 10 days
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These highly efficient flex ducts feature a core that is bonded to the steel wire coil to support the fiberglass insulation. Duct insulation is available in three different R-values for varied thickness: R-4.2, R-6.0 and R-8.0. The acoustically rated, polyethylene inner liner on these HVAC ducts eliminates noise and easily expands. Spiral ducts are mold and mildew resistant. Temperature range is from -20F to 200F and -20F to 250F intermittent. Inner core is self-extinguishing. Ducts measure 4-20" in diameter. Greenguard certified. 10 Year Limited Warranty.

Your review: I needed to replace 23 year old Construction grade ducts that came with the house. The outer plastic wrap was disintegrating. M-Ke offered superior outer wrap and a quieter inner core. I feel M-Ke achieved both with ease in installation. I hope to get another 23 years or more from this product.